Toa VS-900 - Manual (Page 64)

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CHAPTER 4. SUMMARY OF DIALING OPERATIONS AND PRIORITIES
2. PRIORITIES
The VS-900 system offers both Call Priority and Speech Path Priority operations.
(1) Call Priority
Determines the priority order of several calls made simultaneously to a master station or telephone.
(2) Speech Path Priority
Refers to the order of priority assigned to the exchange's speech path to enable higher priority conversation
and call functions in the entire system. According to this priority order, conversations can be terminated or
calls switched to waiting mode.
2.1. Call Priority
2.1.1. Call Priority and call tone (Calls to master stations)
Master stations differ from telephones in their method of processing the priority of multiple incoming calls.
Shown below are priorities of calls made to master stations:
[Call Priority order]
1. Emergency Conference calls
2. Calls from Emergency substations
3. Calls from outside line telephone
4. Calls from Normal substations
5. Calls from master stations or telephones
[Call tone]
The following tone types are used for the above calls:
(1) Emergency Conference call tone indicates an Emergency Conference call.
(2) Emergency call tone indicates a call from an Emergency substation.
(3) Outside line call tone indicates a call from an outside line telephone.
(4) Normal call tone indicates a call from a Normal substation.
(5) Master call tone indicates a call from a master station or telephone.
2.1.2. Call Priority (Calls to telephones)
• When several calls are simultaneously made to a telephone, the first received call is connected, while
succeeding calls must wait in order of the above-described priority.
• Two different call tones are used to distinguish emergency calls from normal calls. The former features
"continuous" sound and the latter "intermittent" sound.
2.1.3. Calls to substations
When several calls are simultaneously made to a substation, the first received call is connected, while
succeeding calls must wait. Only one call tone is used.